Antenna



FIG. 1 is a top perspective view of an antenna, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a side elevation view thereof. 

CLAIM The ornamental design for an antenna, as shown and described. 